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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ba411f52f43f83ea8984a78a85a7511fd690b2d5408420b6e32ba9e4f74eda' 
  AND token = 'ZmY6IOIt3O/DV97rThliAsY3zIB8Jb8evlSS3A0Zi2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}